fix(qwik-router): use z.ZodType instead of removed z.Schema for zod 4 compatibility

[blakeley]

Fixes #8896

zodQrl decided whether a resolved value was already a schema with obj instanceof z.Schema. Schema was a zod-3-only alias for ZodType and was removed in zod 4, so as soon as the router's zod specifier resolves to a v4 copy — which is what happens in hoisted/deduped installs where the app depends on zod 4 — z.Schema is undefined and the instanceof throws TypeError: Right-hand side of 'instanceof' is not callable on the server, turning every zod$ action into a 500. This is not a version-mixing problem: the schema object and the instanceof check come from the same resolved zod module, the alias simply no longer exists. z.ZodType is exported by both zod 3 and zod 4 (in v3 Schema was literally an alias of it), so switching the runtime check — and the matching z.Schema type positions in ZodConstructor / ZodConstructorQRL — to z.ZodType is behaviour-preserving against the repo's pinned zod 3 and correct against zod 4. The API report and generated docs were regenerated with pnpm api.update; the only change there is z_2.Schema → z_2.ZodType.

Minimal reproduction: https://github.com/blakeley/zod4-zodschema-crash — it 500s on the pinned router build and passes with this patch applied, so the fix is verified empirically and not just by inspection.

Relationship to #8887 (zod export tree-shaking): orthogonal. That PR changes how zod is imported/re-exported for bundle size and keeps z.Schema as the detection mechanism, so it does not address this crash; the two should merge cleanly in either order, and if #8887 lands first the z.Schema reference it preserves still needs this change.

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🦋 Changeset detected

Latest commit: 2b017af

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 5 packages

Name	Type
@qwik.dev/router	Patch
eslint-plugin-qwik	Patch
@qwik.dev/core	Patch
create-qwik	Patch
@qwik.dev/react	Patch

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commit: 2b017af